Glossary

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Use this glossary to find definitions of special terms, abbreviations, and acronyms used in this and related publications.

If you do not find the term you are looking for, see the IBM® Terminology Database located at the following website: IBM Terminology website.

The following cross-references are used in this glossary:

See refers you from a nonpreferred term to the preferred term or from an abbreviation to the spelled-out form.
See also refers you to a related or contrasting term.

For other terms and definitions, see the IBM Terminology website (opens in new window).

A B C D E F G H I J K L M N O P R S T U V W

A

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above mean sea level (amsl): The elevation or altitude of an object that is used in broadcasting and other telecommunications by engineers to determine the coverage area a station will be able to reach.
ac: See alternating current.
AC: See alternating current.
access key / secret access key: Credentials provided by IBM Storage Deep Archive for S3 programmatic access.
ACF: See automatic cartridge facility.
Advanced Encryption Standard (AES): A data encryption technique that improved upon and officially replaced the Data Encryption Standard (DES).
advanced library management system (ALMS): A library management system that virtualizes the locations of cartridges in the TS3500 tape library.
Advanced Peer-to-Peer Networking (APPN): An extension to SNA that features distributed network control, dynamic definition of network resources, automated resource registration, and automated directory lookup. This network architecture supports the routing of data in a network between two or more Advanced Peer-to-Peer Communication (APPC) systems that do not need to be directly connected.
Advanced System Management Interface (ASMI): A graphical interface that is part of the service processor firmware. The ASMI manages and communicates with the service processor. The ASMI is required to set up the service processor and to perform service tasks, such as reading service processor error logs, reading vital product data, and controlling the system power.
AES: See Advanced Encryption Standard.
ALMS: See advanced library management system.
alternating current (AC): An electric current that reverses its direction at regularly recurring intervals.
American Standard Code for Information Interchange (ASCII): A standard code used for information exchange among data processing systems, data communication systems, and associated equipment. ASCII uses a coded character set consisting of 7-bit coded characters. See also Extended Binary Coded Decimal Interchange Code.
amsl: See above mean sea level.
application-specific integrated circuit (ASIC): In computer chip design, a integrated circuit created by first mounting an array of unconnected logic gates on a substrate and later connecting these gates in a particular configuration for a specific application. This design approach allows chips for a variety of applications to be made from the same generic gate array, thereby reducing production costs.
APPN: See Advanced Peer-to-Peer Networking.
array: A structure that contains an ordered collection of elements of the same data type in which each element can be referenced by its index value or ordinal position in the collection.
ASCII: See American Standard Code for Information Interchange.
ASIC: See application-specific integrated circuit.
ASMI: See Advanced System Management Interface.
assignment: The naming of a specific device to perform a function.
asynchronous: Pertaining to events that are not synchronized in time or do not occur in regular or predictable time intervals.
attention: An informational, warning or error event that is surfaced to the operator in the form of a message as a means to inform the user of the event.
audit logging: The process of keeping a log of all activities of interest to security personnel. These activities are those that can negatively affect operations if completed incorrectly or maliciously. They include such events as: login attempts, configuration changes, status changes, and code updates.
authentication: In computer security, verification of the identity of a user or process and the construction of a data structure that contains the privileges that were granted to the user or process.
authorization (AuthZ): In computer security, the right granted to a user to communicate with or make use of a computer system.
AuthZ: See authorization.
automatic cartridge facility (ACF): A small automatic tape cartridge loading device that can manage a small number of tapes for a single 3590 Magstar tape drive.

B

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b: See byte.
B: See byte.
back up: To save information or objects on a system, usually to tape or diskette, for safekeeping.
backup object: The first or second backup copy of a primary object in an object backup storage group. Backup copies reside on optical or tape storage.
base operating system (BOS): The collection of programs that controls the resources and the operations of the computer system.
basic input/output system (BIOS): The code that controls basic hardware operations, such as interactions with diskette drives, hard disk drives, and the keyboard.
BER: See bit error rate.
bezel: A removable cover for a computer tower or drive.
binding: The process of persistently saving a type or attribute property of a volume.
BIOS: See basic input/output system.
BIST: See built-in self-test.
bit error rate (BER): The probability that a transmitted bit will be erroneously received. The BER is measured by counting the number of bits in error at the output of a receiver and dividing by the total number of bits in the transmission. BER is typically expressed as a negative power of 10.
BOS: See base operating system.
bucket: The S3 bucket that stores objects written by the IBM TS7785 grid.
buffer: An area of storage that compensates for the different speeds of data flow or timings of events by temporarily holding a block of data that is waiting to be processed or written to an I/O device.
built-in self-test (BIST): An internal testing routine that validates the basic operations of a hardware component.
bus: A facility for transferring data between several devices located between two end points, only one device being able to transmit at a given moment.
byte (B): A string that represents a character and usually consists of eight binary digits that are treated as a unit. A byte is the smallest unit of storage that can be addressed directly.

C

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cache controller: Manages attached cache expansions.
cache drive: Stores cluster cache data within a cache expansion.
cache expansion: Provides drives that can be configured as cluster capacity.
call home: A communication link established between a product and a service provider. The product can use this link to place a call to IBM or to another service provider when it requires service. With access to the machine, service personnel can perform service tasks, such as viewing error and problem logs or initiating trace and dump retrievals.
capacity: The amount of data that can be contained on a storage medium, expressed in bytes of data.
capacity (cluster): Disk storage space within the cluster where data is stored.
cartridge I/O slots (I/O slots): Virtual representation of library I/O slots used to insert or remove cartridges.
cartridge ownership: The cluster that currently owns a virtual cartridge and controls access/behavior via its pool policy.
cartridge pool: A set of cartridges governed by a common policy (replication, cloud tiering, data settings).
cartridge pool capacity: Sum of capacities of all cartridges assigned to the pool.
cartridge serial number: The serial number that identifies a cartridge. In physical cartridges, this is a barcode printed on the cartridge label. This is 6 characters in length (A-Z, 0-9) plus two characters that identify the cartridge type (e.g., “L9” for LTO-9).
cartridge storage tape (CST): The base format of a IBM Z® written 3490 compatible tape cartridge, for example MEDIA1 400MB CST.
CCIN: See custom card identification number.
CDT: See common development test.
CEC: See central electronics complex.
central electronics complex (CEC): See central processor complex.
central processor complex (CPC): A physical collection of hardware that consists of main storage, one or more central processors, timers, and channels.
certificate authority file (CA file): CA certificate file (e.g., ca.pem) used by the syslog server for TCP/TLS.
CKD: See count key data.
CLI: See command-line interface.
cloud network: Network used to connect to a cloud repository.
cloud repositories: Cloud repositories that data is written to for cartridges in a pool.
cloud repository: External public/private object store used for tiering (R1 supports Deep Archive).
cloud tiering: Feature that moves data from the grid to a cloud repository.
cloud tiering settings: Policy that controls tiering to one or more cloud repositories.
cluster: A single TS7785 system inside a grid.
cluster cache: The part of a TS7785 system that provides the storage. It includes the controller and disk drives. The TS7785 cache controllers (CFL) along with the cache expansion (XSL) enclosures are collectively referred as cluster cache.
cluster family: A group of clusters all configured with the same family value in vital product data (VPD).
code level: The cluster’s firmware/microcode level.
Cognitive Support Platform (CSP): A platform that supports IBM’s end‑to‑end Support ecosystem, providing capabilities for IBMers, partners, and clients who work in support roles or interact directly or indirectly with IBM Support.
command-line interface (CLI): A computer interface in which the input and output are text based.
common development test (CDT): A development and test environment for GNA/GWA applications, designed and built in accordance with customer requirements and GWA and GNA standards.
Composite Library ID: The library sequence number reported to a host by each attached virtual tape drive.
concurrent: Pertaining to diagnostic, maintenance, or replacement procedures that can be performed on a system without interrupting customer applications.
construct: A collective term used to refer to the policies that automate storage management through classification of data sets. These include: storage groups, management classes, storage classes, data classes.
controller: A device that coordinates and controls the operation of one or more input/output devices (such as workstations) and synchronizes the operation of such devices with the operation of the system as a whole.
controller drawer: A physical enclosure which contains controller cards. See also expansion drawer.
control unit (CU): A device that coordinates and controls the operation of one or more input/output devices. For example, a TS7785 has up to 31 control units, each one emulating 16 3490E logical tape drives.
Coordinated Universal Time (UTC): The international standard of time that is kept by atomic clocks around the world.
copy: The replication of a virtual cartridge from one site to another across the connecting infrastructure.
copy delay: Days to wait before first copying data to cloud after it is written to the grid.
copy everywhere: Replication mode that keeps one copy on the receiving cluster and replicates asynchronously to all other clusters.
copy to cloud: Tiers data to a lower‑cost storage class while keeping a copy resident in the grid for continuous access.
count key data (CKD): A data recording format that uses self-defining record formats in which each record on a volume is represented by up to three fields: a count field identifying the record and specifying its format, an optional key field that can be used to identify the data area contents, and an optional data field that typically contains the user data.
CPC: See central processor complex.
CRC: See cyclic redundancy check.
CRU: See customer-replaceable unit.
CSP: See Cognitive Support Platform (CSP).
CST: See cartridge storage tape.
CSV file: A text file that contains comma-separated values. A CSV file is commonly used to exchange files between database systems and applications that use different formats.
CU: See control unit.
custom (advanced) replication: Per‑pair replication settings (no copy or deferred copy) and per‑cluster retention (keep / do not keep); typically used with IBM guidance.
custom card identification number (CCIN): A unique alphanumeric number that is assigned many individual hardware parts or assemblies.
customer network: Network used for management access (GUI/REST) and external key servers.
customer-replaceable unit (CRU): An assembly or part that can be replaced in its entirety by a user when any one of its components fails.
cyclic redundancy check (CRC): A system of error checking performed at both the sending and receiving station after a block-check character has been accumulated.

D

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DAA: See device allocation assistance.
DASD: See direct access storage device.
data: A representation of facts or instructions in a form suitable for communication, interpretation, or processing by human or automatic means. Data includes constants, variables, arrays, and character strings.
Data Facility Storage Management Subsystem (DFSMS): An operating environment that helps automate and centralize the management of storage. To manage storage, the storage management subsystem (SMS) provides the storage administrator with control over data class, storage class, management class, storage group, and automatic class selection (ACS) routine definitions.
data key (DK): In cryptography, a key that is used to encrypt or decrypt data only, but not to encrypt or decrypt other keys.
data settings: Policy options such as cartridge capacity, compression method.
data1: URL/IP/host name of the virtual data interface on the Deep Archive system.
DC: See direct current.
DDM: See disk drive module.
DDR1: See double data rate first generation.
dedicated service tool (DST): The part of the service function used to service the system when the operating system is not running.
dense wavelength division multiplexing (DWDM): A technology that places many optical signals onto one single-mode fiber using slightly different optical frequencies. DWDM enables many data streams to be transferred in parallel.
detent: A catch or lever that holds another part in place.
device allocation assistance (DAA): A function that allows the host to query the TS7785 Virtualization Engine to determine which clusters should be preferred for a private (specific) mount request.
device ID: SCSI device identifier for a virtual tape drive.
device mappings: Tape‑drive and media‑changer devices available to hosts in a host group.
DFS: See Distributed File Service.
DFSMS: See Data Facility Storage Management Subsystem.
DFSMSdfp: A DFSMS functional component and a base element of z/OS that provides functions for storage management, data management, device management, and distributed data access.
DFSMShsm: A DFSMS functional component or base element of z/OS that provides functions for backing up and recovering data, and managing space on volumes in the storage hierarchy.
DFSMSrmm: A DFSMS functional component or base element of z/OS, that manages removable media (tape volumes, tape data sets, and tape libraries).
DHCP: See Dynamic Host Configuration Protocol.
digital versatile disc (DVD): An optical disc that has the same overall dimensions of a CD-ROM, but has significantly higher capacities than a CD-ROM. DVDs are also double sided, whereas CD-ROMs are single sided.
DIMM: See dual inline memory module.
direct access storage device (DASD): A device that allows storage to be directly accessed, such as a disk drive. See also random access memory.
direct current (DC): Electric current that flows in a single direction and at a constant voltage.
direct memory access (DMA): The transfer of data between memory and an input/output device without processor intervention.
disk drive module (DDM): A field-replaceable unit (FRU) that consists of a single disk drive and its associated packaging.
disk-only: Pertaining to a cluster that does not attach to a physical tape library; it stores all data in cache.
Distributed File Service (DFS): A component of a Distributed Computing Environment (DCE) that enables a single, integrated file system to be shared among all DCE users and host computers in a DCE cell. DFS prevents DCE users from simultaneously modifying the same information.
Distributed Library ID: The unique library sequence number possessed by each cluster in a grid configuration.
DK: See data key.
DLO: See document library object.
DLPAR: See dynamic LPAR.
DMA: See direct memory access.
document library object (DLO): Any system object that resides in the document library, such as RFT and FFT documents, folders, and PC files.
double data rate first generation (DDR1): The first generation of memory DIMMs which have double the speed of single data rate (SDR) memory.
DRAM: See dynamic random access memory.
drawer: A unit that contains multiple disk drive modules (DDMs) and provides power, cooling, and related interconnection logic to make the DDMs accessible to attached host systems.
DST: See dedicated service tool.
dual inline memory module (DIMM): A small circuit board with memory-integrated circuits containing signal and power pins on both sides of the board.
DVD: See digital versatile disc.
DWDM: See dense wavelength division multiplexing.
Dynamic Host Configuration Protocol (DHCP): A communications protocol that is used to centrally manage configuration information. For example, DHCP automatically assigns IP addresses to computers in a network.
dynamic LPAR (DLPAR): The ability to move processors, memory, and interactive performance between logical partitions without restarting a logical partition or the server. See also logical partition.
dynamic random access memory (DRAM): Storage in which the cells require repetitive application of control signals to retain stored data.

E

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EBCDIC: See Extended Binary Coded Decimal Interchange Code.
EC: See engineering change.
ECC: See error correction code.
EEDK: See externally encrypted data key.
EEH: See extended error handling.
EIA: See Electronics Industries Association.
EIA unit: A unit of measure, established by the Electronic Industries Association, equal to 44.45 millimeters (1.75 inches).
EiB: See exbibyte.
EKM: See External Key Manager.
electromagnetic compatibility (EMC): The design and test of products to meet legal and corporate specifications dealing with the emissions and susceptibility to frequencies in the radio spectrum. Electromagnetic compatibility is the ability of various electronic equipment to operate properly in the intended electromagnetic environment.
Electronics Industries Association (EIA): An organization of electronics manufacturers that advances the technological growth of the industry, represents the view of its members, and develops industry standards.
electrostatic discharge (ESD): The flow of current that results when objects having a static charge come into close enough proximity to discharge.
EMC: See electromagnetic compatibility.
emergency power off (EPO): A means of turning off power during an emergency, referring usually to a switch.
enclosure services manager (ESM): A redundant and hot-swappable SAS communication FRU that provides SAS expander and SES functions.
encryption key server: Server that stores keys for cache encryption (e.g., GKLM 4.1, SKLM).
engineering change (EC): An update to a machine, part, or program. Each EC for a given unit is assigned a unique number referred to as an EC level or EC number.
events: Notifications that report warnings/errors and recommended actions.
environmental recording, editing, and printing (EREP): The program that formats and prepares reports from the data contained in the error recording data set.
EPO: See emergency power off.
EPROM: See erasable programmable read-only memory.
equipment check: An asynchronous indication of a malfunction.
erasable programmable read-only memory (EPROM): A type of memory chip that can retain its contents without electricity. Unlike the programmable read-only memory (PROM), which can be programmed only once, the EPROM can be erased by ultraviolet light and then reprogrammed.
ERDS: See error-recording data set.
EREP: See environmental recording, editing, and printing.
error correction code (ECC): A code appended to a data block that has the capability to detect and correct multiple bit errors within the block.
error log: A data set or file that is used to record error information about a product or system.
error-recording data set (ERDS): On S/390 and zSeries hosts, a data set that records data-storage and data-retrieval errors. A service information message (SIM) provides the error information for the ERDS.
ESD: See electrostatic discharge.
ESM: See enclosure services manager.
Ethernet port: Physical port on the Ethernet switch.
Ethernet switch: Provides connectivity to other clusters, cloud repositories, and management networks.
exbibyte (EiB): IEC Standard is 1024 pebibytes.
expansion drawer: A drawer that expands the disk capacity of the disk subsystem. These drawers do not contain any controller cards. See also controller drawer.
Extended Binary Coded Decimal Interchange Code (EBCDIC): A coded character set of 256 8-bit characters developed for the representation of textual data. See also American Standard Code for Information Interchange.
extended error handling (EEH): An error-recovery mechanism for errors that occur during load and store operations on the PCI bus.
External Key Manager (EKM): The external server used to manage the EEDK keys in a solution which supports encryption (for example: ISKLM).
externally encrypted data key (EEDK): A method of cryptographically encrypting a Data Key (DK) using an externally managed encryption key, allowing the data key to be stored within the media device in encrypted form.
external encryption: Cache‑data encryption with keys managed by external key servers.

F

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failing function code (FFC)

A numeric code that identifies which function failed within the system.

fault symptom code (FSC)

A hexadecimal code generated by the drive or the control unit microcode in response to a detected subsystem error.
A numeric code that identifies which process or component that appears to be at fault for a system or hardware failure.

feature key

IBM‑provided code used to enable a licensed feature on a cluster.

FC

See feature code.

FC-AL

See Fibre Channel Arbitrated Loop.

FCP

See Fibre Channel Protocol.

FDDI

See Fiber Distributed Data Interface.

feature code (FC)

A code used by IBM to process hardware and software orders.

FEC

Forward error correction (FEC)

FFC

See failing function code.

Fiber Distributed Data Interface (FDDI)

An American National Standards Institute (ANSI) standard for a 100 Mbps LAN using fiber optic cables.

Fibre Channel Arbitrated Loop (FC-AL)

An implementation of the Fibre Channel standards that uses a ring topology for the communication fabric; refer to American National Standards Institute (ANSI) INCITS 272-1996, (R2001). In this topology, two or more Fibre Channel end points are interconnected through a looped interface.

Fibre Channel Protocol (FCP)

The serial SCSI command protocol used on Fibre Channel networks.

FID

See FRU Identifier.

field-replaceable unit (FRU)

An assembly or part that is replaced in its entirety by service personnel when any one of its components fails.

FIFO

See first-in first-out.

file

A named set of records stored or processed as a unit.

file system (FS)

The collection of files and file management structures on a physical or logical mass storage device, such as a diskette or minidisk.
In the hierarchical file system, the underlying system support that manages I/O operations to files and controls the format of information on the storage media. A file system allows applications to create and manage files on storage devices and to perform I/O operations to those files.
A collection of files and certain attributes associated with those files.

File Transfer Protocol (FTP)

In TCP/IP, an application layer protocol that uses TCP and Telnet services to transfer bulk-data files between machines or hosts.

first-in first-out (FIFO)

A queuing technique in which the next item to be retrieved is the item that has been in the queue for the longest time.

flexible service processor (FSP)

Firmware that provides diagnostics, initialization, configuration, runtime error detection, and correction. The flexible service processor connects the managed system to the Hardware Management Console.

format

The arrangement or layout of data in a data medium.

format (cartridge)

Media format of a virtual tape cartridge (currently LTO‑5).

Forward error correction (FEC)

Forward error correction (FEC) or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels.

FRU

See field-replaceable unit.

FRU Identifier (FID)

A short code that can be used by service technicians to isolate problems with the 3592 tape drive.

FS

See file system.

FSC

See fault symptom code.

FSP

See flexible service processor.

FTP

See File Transfer Protocol.

functional microcode

Microcode that is resident in the machine during normal customer operation.

G

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Gb: See gigabit.
GB: See gigabyte.
Gbps: See gigabits per second.
General Parallel File System (GPFS): A high-performance shared-disk file system that can provide data access from nodes in a clustered system environment.
GHz: See gigahertz.
GiB: See gibibyte.
gibibyte (GiB): In digital information storage, a base-2 unit of measurement equal to 1,073,741,824 bytes (2 to the 30th power). See also gigabyte.
Gigabaud Link Module (GLM): An encoding/decoding device that is a Class-1 laser component assembly with transmitting and receiving receptacles that connect to fiber-optic cables. The GLM provides the link-control facility for an N_port. It converts electrical signals from parallel to serial to optical when transmitting, and the opposite when receiving. GLMs are not hot-swappable.
gigabit (Gb): In data communications, 10 to the power of 9 or 1,000,000,000 bits. See also gigabyte.
gigabits per second (Gbps): A measure of high speed bandwidth on a digital data transmission medium such as optical fiber.
gigabyte (GB): For processor storage, real and virtual storage, and channel volume, two to the power of 30 or 1,073,741,824 bytes. For disk storage capacity and communications volume, 1,000,000,000 bytes. See also gibibyte, gigabit.
gigahertz (GHz): A unit of frequency equal to 1,000,000,000 hertz.
GLM: See Gigabaud Link Module.
GMT: See Greenwich mean time.
gNode: The combination of the distributed nodes hNode and vNode in the TS7785 Virtualization Engine
GPFS: See General Parallel File System.
graphical user interface (GUI): Web‑based interactive management interface.
Greenwich mean time (GMT): The mean solar time at the meridian of Greenwich, England.
grid: A set of clusters that together provide a data‑resiliency solution where virtual cartridge attributes and data are replicated across the clusters to ensure the continuation of production work.
grid network: The TCP/IP infrastructure connecting a grid used for inter‑cluster communication.
grid retention: How long data remains in the grid after tiering to cloud: retain until capacity is needed (LRU) or remove immediately.
grid summary: Exportable JSON report aggregating objects returned by all supported REST GET endpoints.
GUI: See graphical user interface.
GUI/API level: Software level of the GUI and REST API on the cluster.

H

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HA

See high availability.

hardware configuration definition (HCD)

An interactive interface in z/OS that is used to define hardware configurations to the operating system and the channel subsystem.

Hardware Management Console (HMC)

A system that controls managed systems, including the management of logical partitions and use of Capacity Upgrade on Demand. Using service applications, the HMC communicates with managed systems to detect and consolidate information, which is then sent to IBM for analysis.

hardware service manager (HSM)

A tool for displaying and working with system hardware from both a logical and a packaging viewpoint, for debugging input/output processors (IOPs) and devices, and for fixing failing and missing hardware.

HBA

See host bus adapter.

HCA

See host channel adapter.

HCD

See hardware configuration definition.

head of string

The first controller enclosure in a string. See also string.

health check

A periodic heartbeat that verifies the grid has access to the cloud repository. The period is selectable by the user.

hertz (Hz)

A unit of frequency equal to one cycle per second.

hex

See hexadecimal.

hex, HEX

See hexadecimal.

hexadecimal (hex, hex, HEX)

Pertaining to a numbering system that has a base of 16.

hierarchical storage management (HSM)

A function that automatically distributes and manages data on disk, tape, or both by regarding devices of these types and potentially others as levels in a storage hierarchy that range from fast, expensive devices to slower, cheaper, and possibly removable devices. The objectives are to minimize access time to data and maximize available media capacity.

high availability (HA)

Pertaining to a clustered system that is reconfigured when node or daemon failures occur so that workloads can be redistributed to the remaining nodes in the cluster.

High-Performance Parallel Interface (HIPPI)

An ANSI-standard, high-speed, connection-oriented, communication channel. It is used primarily to connect supercomputers and as a high-speed LAN.

high-speed link (HSL)

A hardware connectivity architecture that links system processors to system I/O buses and other systems.

HIPPI

See High-Performance Parallel Interface.

HiPPI

See High-Performance Parallel Interface.

HMC

See Hardware Management Console.

hNode

A distributed node in the TS7785 Virtualization Engine that performs all management of a virtual cartridge residing in disk cache or physical tape after it has been created or altered by the host system through a vNode.

host

Server that communicates with the grid via host ports zoned to cluster ports.

host adapter

See host port.

host bus adapter (HBA)

An interface card that connects a host bus, such as a peripheral component interconnect (PCI) bus, to the storage area network.

host channel

The communication path between the disk subsystem and the Linux controller. The disk subsystem has fibre connections to the Linux controller and to its physical drives. From the viewpoint of the disk subsystem, the Linux controller is the host.

host channel adapter (HCA)

Based on InfiniBand technology, a port connection on a system allowing a network fabric interconnect.

host group

Set of hosts using the same virtual tape drives via the same virtual ports.

host mappings

Hosts included in a host group.

host port

Port on a host that communicates with virtual tape drives through virtual ports.

host port identifier

The unique numerical identifier to a host port using the adapter's world-wide node name (WWNN) which is set by factory for each adapter and is unique to that adapter.

host port mappings

Host ports mapped to a host group.

HSL

See high-speed link.

HSM

See hardware service manager.
See hierarchical storage management.

HTML

See Hypertext Markup Language.

Hypertext Markup Language (HTML)

A markup language that conforms to the Standard Generalized Markup Language (SGML) standard and was designed primarily to support the online display of textual and graphical information, including hypertext links.

Hz

See hertz.

I

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IB

See InfiniBand.

IBM TS7785

Product name.

ICSF

See integrated cryptographic service facility.

ID

See identifier.

IDE

See integrated development environment.

identifier (ID)

A sequence of bits or characters that identifies a user, program, device, or system to another user, program, device, or system.
In programming languages, a lexical unit that names a language object, such as the name of an array, record, label, or procedure. An identifier usually begins with a letter optionally followed by letters, digits, or other characters.
One or more characters used to identify or name a data element and possibly to indicate certain properties of that data element.

IEC

See International Electrochemical Commission.

IML

See initial microprogram load.

IMPL

See initial microprogram load.

incoming copy queue

Virtual cartridges waiting to be copied to this cluster from other clusters; each cluster maintains its own queue.

InfiniBand (IB)

An industry-standard specification that defines an I/O architecture used to connect servers, communications infrastructure equipment, storage, and embedded systems.

initial microprogram load (IML, IMPL)

The action of loading microprograms into computer storage.

initial program load (IPL)

The process that loads the system programs from the system auxiliary storage, checks the system hardware, and prepares the system for user operations.

initiator

The component that executes a command. The initiator can be the host system or the tape control unit.

input/output (I/O)

Pertaining to a device, process, channel, or communication path involved in data input, data output, or both.

integrated cryptographic service facility (ICSF)

A software element of z/OS that works with hardware cryptographic features and RACF to provide secure, high-speed cryptographic services.

integrated development environment (IDE)

A set of software development tools, such as source editors, compilers, and debuggers, that are accessible from a single user interface.

Interactive Storage Management Facility (ISMF)

An Interactive System Productivity Facility (ISPF) application that provides an interactive set of space management functions for users and storage administrators.

interface

A shared boundary between independent systems. An interface can be a hardware component used to link two devices, a convention that supports communication between software systems, or a method for a user to communicate with the operating system, such as a keyboard.

internal encryption

Cache‑data encryption with keys generated and managed by the clusters.

internal network

Not customer‑managed; connects internal components within a cluster.

International Electrochemical Commission (IEC)

The international standards-setting organization responsible for electrical and electrotechnical issues. IEC often cooperates with ISO via technical committees on the definition of standards.

inter-switch link (ISL)

The physical connection that carries a protocol for interconnecting multiple routers and switches in a storage area network (SAN).

I/O

See input/output.

IPL

See initial program load.

ISL

See inter-switch link.

ISMF

See Interactive Storage Management Facility.

J

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JBOD: See just a bunch of disks.
JCL: See job control language.
JFS: See journaled file system.
job control language (JCL): A command language that identifies a job to an operating system and describes the job requirements.
journaled file system (JFS): The local file system in the Linux operating system.
just a bunch of disks (JBOD): Hard disks that haven't been configured according to the RAID system to increase fault tolerance and improve data access performance.

K

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KB: See kilobyte.
KEK: See key-encrypting key.
key-encrypting key (KEK): A key that is used exclusively for encrypting and decrypting keys.
KiB: See kibibyte.
kibibyte (KiB): A base-2 unit of measurement that is equal to 1,024 bytes (2 to the 10th power). See also kilobyte.
kilobyte (KB): For processor storage, real and virtual storage, and channel volume, 2 to the power of 10 or 1,024 bytes. For disk storage capacity and communications volume, 1,000 bytes. See also kibibyte.
kilovolt amperes (kVA): A unit of power.
kVA: See kilovolt amperes.

L

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LAN: See local area network.
last mounted: Timestamp when a cartridge was last mounted in a drive.
LAU: See local authentication.
LBA: See logical block address.
LED: See light-emitting diode.
library (cartridge attribute): The virtual library a cartridge is inserted into; shelf if not inserted.
library manager (LM): The software application that controls all operations in an Automated Tape Library Dataserver (ATLDS) or in a file.
library type: Type of virtual library (currently TS4500).
LIC: See Licensed Internal Code.
licensed feature: A license that enables or activates a particular function, hardware, or capability within the grid.
Licensed Internal Code (LIC): The layered architecture below the machine interface (MI). The Licensed Internal Code is a proprietary system design that carries out many functions. These functions include but are not limited to storage management, pointers and addressing, program management functions, exception and event management, data functions, I/O managers, and security.
LID: See local identifier.
light-emitting diode (LED): A semiconductor chip that gives off visible or infrared light when activated.
Lightweight Third Party Authentication (LTPA): An authentication framework that allows single sign-on across a set of web servers that fall within an Internet domain.
LIP: See loop initialization primitive.
LM: See library manager.
local area network (LAN): A network that connects several devices in a limited area (such as a single building or campus) and that can be connected to a larger network. See also wide area network.
local authentication (LAU): The process of validating a user identity to the system according to the local operating system account to which the user logged in. If the user is authenticated, the user is mapped to a principal.
local copy only: Replication mode that keeps one copy on the receiving cluster only.
local identifier (LID): In a distributed relational database, an identifier or short label that is mapped by the environmental descriptors to a named resource.
local user account: Credentials used to authenticate to the grid’s management interfaces.
location (hardware)
location (hardware): Attribute describing where a component is physically installed in the cluster.
logged in: Indicates whether a host port is logged in to a specific cluster/virtual port via SCSI (path cabled, zoned, and active).
logical block address (LBA): The block number on a disk.
logical partition (LP, LPAR): One or more virtualized images of a hardware computing system that can include shared and dedicated resources assigned from the pool of resources available on a physical server. Each image appears to the operating system running within it to be a unique instance of a physical server. See also dynamic LPAR.
logical subsystem (LSS): The logical functions of a storage controller with which one or more host I/O interfaces can access a set of devices. The controller groups the devices according to the addressing mechanisms of the associated I/O interfaces. One or more LSSs exist on a storage controller. In general, the controller associates a given set of devices with only one LSS.
logical unit number (LUN): In the Small Computer System Interface (SCSI) standard, a unique identifier used to differentiate devices, each of which is a logical unit (LU).
virtual cartridge (LV): A collection of physical partitions organized into logical partitions, all contained in a single volume group. Logical volumes are expandable and can span several physical volumes in a volume group.
Logical Volume Manager (LVM): A set of system commands, library routines, and other tools that allow the user to establish and control virtual cartridge (LVOL) storage. The LVM maps data between the logical view of storage space and the physical disk drive module (DDM).
long wave laser (LW): Single Mode Fibre (SMF), which utilizes a transmitter which emits light in longer wavelength forms. Such Fibre Channel connections tend to support longer single fibre distances when compared to its counterpart Multi Mode Fibre (MMF) or shortwave connections.
loop initialization primitive (LIP): A Fibre Channel primitive used to indicate a loop failure, reset a specific node, or initiate a procedure that results in unique addressing for all nodes.
LP: See logical partition.
LPAR: See logical partition.
LSS: See logical subsystem.
LTPA: See Lightweight Third Party Authentication.
LUN: See logical unit number.
LV: See virtual cartridge.
LVM: See Logical Volume Manager.
LW: See long wave laser.

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MAC

See Media Access Control.

machine type and model (MTM)

Machine type and model. For example, 4883‑L9A.

magnetic tape

A tape with a magnetic surface layer on which data can be stored.

main storage dump (MSD)

A process of collecting data from the system's main storage. It can be done automatically by the service processor as a result of a system failure, or it can be performed manually by the operator when there appears to be a system failure.

maintenance analysis procedure (MAP)

In hardware maintenance, a step-by-step procedure that assists an IBM service representative to trace a symptom to the cause of the failure.

management interfaces

Interfaces used to monitor and manage the grid and its settings.

MAP

See maintenance analysis procedure.

mask

To use a pattern of characters to control retention or elimination of portions of another pattern of characters.
A pattern of bits or characters that controls the keeping, deleting, or testing of portions of another pattern of bits or characters.

MB

See megabyte.

Mbps

See megabits per second.

MCM

See multiple chip module.

MDE

See microcode detected error.

mebibyte (MiB)

A base-2 unit of measurement that is equal to 1,048,576 bytes (2 to the 20th power). See also megabyte.

Media Access Control (MAC)

In networking, the lower of two sublayers of the Open Systems Interconnection model data link layer. The MAC sublayer handles access to shared media, such as whether token passing or contention will be used.

media changer

Device representing the library robot; target for SCSI mount/demount commands.

media information message (MIM)

A message that identifies problems with the media (tape) and the volume number of the bad cartridge. This identification allows the customer to do maintenance within the tape library and to prevent unnecessary service calls when the fault is media.

megabits per second (Mbps)

A measure of bandwidth on a data transmission medium, where 1 Mbps = 1,000,000 bits per second.

megabyte (MB)

For processor storage, real and virtual storage, and channel volume, 2 to the 20th power or 1,048,576 bytes. For disk storage capacity and communications volume, 1,000,000 bytes. See also mebibyte.

megahertz (MHz)

A unit of measure of frequency. One megahertz equals 1 000 000 hertz.

MES

See miscellaneous equipment specification.

MHz

See megahertz.

MiB

See mebibyte.

microcode

To design, write, and test one or more microinstructions.
Stored microinstructions, not available to users, that perform certain functions.
A code, representing the instructions of an instruction set, that is implemented in a part of storage that is not program-addressable. See also microprogram.

microcode detected error (MDE)

A numeric 16-bit value that is assigned to a particular error or event which was detected by the solution microcode.

microinstruction

A basic or elementary machine instruction.

microprogram

A group of microinstructions that when executed performs a preplanned function. Micorinstructions can include a dynamic arrangement or selection of one or more groups of microinstructions for execution to perform a particular function. See also microcode.

MIM

See media information message.

miscellaneous equipment specification (MES)

A hardware change that is made after the time of the initial order.

MMF

See multimode fiber.

modifier

A word or quantifier that is used to change an instruction, thereby causing the execution of a different instruction. Consequently, the original instruction, successively changed by a modifier, can be used repetitively to carry out a different operation each time it is used.

mount

A host command to load a tape cartridge into a tape drive.

MPIO

See multipath I/O.

MSD

See main storage dump.

multimode fiber (MMF)

An optical fiber that is designed to carry multiple light rays or modes concurrently, each at a slightly different reflection angle within the optical fiber core.

MMF fiber is currently 50 microns in diameter (older version was 62.5 micron) and carries Short Wave length optical signals. The length allowed decreases as the gig hertz of the optical signal increases. The MM fiber casing (used to be orange in color) and the improved MM fiber casing is aqua in color.

multipath

A storage configuration that supports multiple paths from servers to disks.

multipath I/O (MPIO)

A framework that enables multiple storage connections and provides automatic failover between connections to ensure that storage is accessible in case of a hardware failure.

multiple chip module (MCM)

The fundamental processor building block of some IBM Power Systems servers.

Multiple Virtual Storage (MVS)

An IBM operating system that accesses multiple address spaces in virtual storage.

MVS

See Multiple Virtual Storage.

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name (library)

Customer‑specified name for a virtual library; unique within the grid.

NAT

See network address translation.

NetTerm

A configurable terminal emulator designed for Internet and intranet connections.

network address translation (NAT)

The conversion of a network address that is assigned to a logical unit in one network into an address in an adjacent network.
In a firewall, the conversion of secure Internet Protocol (IP) addresses to external registered addresses. This enables communications with external networks but masks the IP addresses that are used inside the firewall.

network file server (NFS)

A protocol that allows a computer to access files over a network as if they were on its local disks.

network interface controller (NIC)

Hardware that provides the interface control between system main storage and external high-speed link (HSL) ports.

Network Time Protocol (NTP)

A protocol that synchronizes the clocks of computers in a network.

NFS

See network file server.

NIC

See network interface controller.

node

A single replaceable unit within a IBM® Virtualization Engine TS7785. Nodes are the elements that run the functional code and perform all the system logic. Each node consists of one or more processors, memory, and I/O ability.

Non‑Volatile Memory Express (NVMe)

A technology that enables modern flash‑based storage devices (such as SSDs) to deliver fast, efficient local performance.

nonce

A random, unique text string that is encrypted along with data and then is used to detect attacks against the system that sends the encrypted data. A nonce is used especially for authentication and ensures that encrypted data is different each time that it is encrypted.

nonvolatile random access memory (NVRAM)

Random access memory (storage) that retains its contents after the electrical power to the machine is shut off.

NTP

See Network Time Protocol.

NVMe

See Non‑Volatile Memory Express

NVRAM

See nonvolatile random access memory.

O

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offline: Pertaining to the operation of a device that is not under the control of a system. See also online.
one copy per region: A replication setting that ensures one copy of the data is kept on a cluster in each region.
online: Pertaining to the operation of a functional unit or device that is under the control of the system or of a host. See also offline.
overrun: The loss of data because a receiving device is unable to accept data at the rate it is transmitted.
ownership takeover: Determines whether remaining clusters may take ownership of cartridges from a failed cluster (read‑only or read‑write) or whether ownership is restored when the failed cluster returns.

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paired copy: Replication mode keeping one copy per region by pairing each cluster with one in every other region; hosts should balance writes within a region.
PAL: See product activity log.
parameter: A variable that is given a constant value for a specified application and that may denote the application.
PCI: See Peripheral Component Interconnect.
PCI host bridge (PHB): A device that merges data from PCI bridges for delivery to the system processor.
PDF: See Portable Document Format.
PDU: See power distribution unit.
pebibyte (PiB): A base-2 unit of measurement that is equal to 1 125 899 906 842 624 bytes bytes (2 to the 50th power).
Peripheral Component Interconnect (PCI): A local bus that provides a high-speed data path between the processor and attached devices.
PFA: See Predictive Failure Analysis.
PHB: See PCI host bridge.
PiB: See pebibyte.
pool: A group of physical tape cartridges.
POR: See power-on reset.
port: An end point for communication between applications, generally referring to a logical connection. A port provides queues for sending and receiving data. Each port has a port number for identification.
Portable Document Format (PDF): A standard specified by Adobe Systems, Incorporated, for the electronic distribution of documents. PDF files are compact; can be distributed globally via email, the web, intranets, or CD-ROM; and can be viewed with the Acrobat Reader.
POST: See power-on self-test.
power cord: The electrical connection between the AC power source and the computer.
power distribution unit (PDU): A device that is used to distribute electrical power to datacenter equipment.
power-on reset (POR): A key sequence that restarts the operating system (or other program) without turning off the electrical power of the system.
power-on self-test (POST): A series of internal diagnostic tests activated each time the system power is turned on.
PPS: See primary power supply.
Predictive Failure Analysis (PFA): A scheduled evaluation of system data that detects and signals parametric degradation which might lead to functional failures.
premigration: The process of copying data that is eligible for migration to a lower tier of storage, such as physical tape, but leaving the original instance intact.
primary power supply (PPS): A power supply that attaches to the customer's ac input power; generates and distributes 390 V dc; and controls and monitors associated power functions.
processor: In a computer, the part that interprets and executes instructions. Two typical components of a processor are a control unit and an arithmetic logic unit.
product activity log (PAL): A log of system data, Licensed Internal Code data, software components, subsystem information, and I/O device data.
program temporary fix (PTF): A fix that is made available to all customers. A program temporary fix is tested by IBM. It contains a PTF record.
programmatic access: Deep Archive account setting that enables S3 access and generates an access key and secret key.
PTF: See program temporary fix.

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RAID

See Redundant Array of Independent Disks.

RAM

See random access memory.

random access memory (RAM)

Computer memory in which any storage location can be accessed directly. See also direct access storage device.

RAS

See reliability, availability, and serviceability.

RAS menus

An interface tool of the Linux operating system for installing, maintaining, configuring, and diagnosing tasks.

read-only

Pertaining to data that can be read but cannot be modified.

read ownership takeover (ROT)

A mode enabled for a failed cluster that allows volume ownership to be taken from a failed TS7785 Cluster by any other available TS7785 Cluster. Only read access to the volume is allowed through the remaining TS7785 Clusters in the event the volume is taken over. Once ownership for a volume has been taken in this mode, any operation attempting to modify data on that volume or change its attributes fails.

reason code

A value used to indicate the specific reason for an event or condition.

recall

To move a virtual cartridge from a physical volume to the cache.

recoverable error

An error condition that can be automatically corrected (for example, by retry operation) and, when corrected, allows continued processing of a job, a program, or a hardware function.

reduced instruction set computing (RISC)

A computer that uses a small, simplified set of frequently used instructions for rapid processing.

Redundant Array of Independent Disks (RAID)

A collection of two or more physical disk drives that present to the host an image of one or more logical disk drives. In the event of a physical device failure, the data can be read or regenerated from the other disk drives in the array due to data redundancy. See also Serial Storage Architecture.

reference code

A group of characters that identifies the machine status or a specific error condition.

region

Describes a cluster’s location; groups relatively close clusters to prioritize consistency through intelligent mounts and cooperative replication.

reliability, availability, and serviceability (RAS)

A combination of design methodologies, system policies, and intrinsic capabilities that, taken together, balance improved hardware availability with the costs required to achieve it. Reliability is the degree to which the hardware remains free of faults. Availability is the ability of the system to continue operating despite predicted or experienced faults. Serviceability is how efficiently and nondisruptively broken hardware can be fixed.

Remote Supervisor Adapter (RSA)

An IBM service processor that is built into some System x servers and available as an optional adapter for use with others. When used as a gateway service processor, the RSA can communicate with all service processors on the Advanced System Management (ASM) interconnect.

replication settings

Cartridge policy settings that control how data is replicated among clusters in the grid.

resource ID

The programmable list entry ID that IMS specifies for a resource to ensure name uniqueness. The first byte is the name type, and the remaining 11 bytes are the resource name, padded with blanks.

resource manager (RM)

A subsystem or component that manages resources that can be involved in transactions. Resource managers can be categorized as work managers, data resource managers, and communication resource managers.

REST API (API)

Programmatic management interface that allows systems to communicate and provides access to resources via HTTP endpoints. It uses standard HTTP methods such as GET, POST, PATCH, and DELETE.

Returned Part Miscellaneous Equipment Specification (RPMES)

A special miscellaneous equipment specification that requires the return of selected parts to IBM on completion of the MES.

RISC

See reduced instruction set computing.

Rivest-Shamir-Adleman algorithm (RSA)

A public-key encryption technology developed by RSA Data Security, Inc, and used in the IBM implementation of TLS.

RM

See resource manager.

ROT

See read ownership takeover.

RPMES

See Returned Part Miscellaneous Equipment Specification.

RSA

See Remote Supervisor Adapter.
See Rivest-Shamir-Adleman algorithm.

S

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SAA

See scratch allocation assistance.

SAN

See storage area network.

SAS

See serial-attached SCSI.

SC

See Standard Connector.

SCC

See Serial Communication Controller.

scratch allocation assistance (SAA)

An extension of the device allocation assistance (DAA) function for scratch mount requests. It filters the list of clusters in a grid to return to the host a smaller list of candidate clusters specifically designated as scratch mount candidates.

serial number (SN)

Unique serial number automatically assigned to a virtual tape drive when created.

scratch pool

The collection of tape cartridges from which requests for scratch tapes can be satisfied.

SCSI

See Small Computer System Interface.

SCSI Enclosure Services (SES)

A subset of the small computer system interface (SCSI) protocol used to monitor temperature, power, and fan status for enclosure devices.

SDLC

See Synchronous Data Link Control.

SDRAM

See synchronous dynamic random access memory.

serial-attached SCSI (SAS)

A data-transfer technology that moves data to and from computer storage devices. Serial-attached SCSI uses a point-to-point serial protocol, which replaces the traditional, parallel SCSI bus technology.

Serial Communication Controller (SCC)

A MULTIBUS board providing four high-speed RS-232-C serial interface ports to support the High-Level Data Link Control (HDLC) data-link protocol for use in X.25 networks.

Serial Storage Architecture (SSA)

An American National Standards Institute (ANSI) standard, implemented by IBM, for a high-speed serial interface that provides point-to-point connection for peripherals, such as storage arrays. See also Redundant Array of Independent Disks.

server

Facilitates data transfer between hosts and data storage.

server certificate (syslog)

Certificate file used by the syslog server (e.g., cert.pem).

server drive

Stores software and management data used by the servers.

server key (syslog)

Private key file used by the syslog server (e.g., key.pem).

service information message (SIM)

A message, generated by a storage subsystem, that is the result of error event location and analysis. A SIM indicates that some service action is required.

service request number (SRN)

A code that is used by service technicians or the customer to determine the failing area of the system.

SES

See SCSI Enclosure Services.

SFP

See Small Form-factor Pluggable.

short wave laser (SW)

Single Mode Fibre (SMF), which utilizes a transmitter that emits light in shorter wavelength forms. Such Fibre Channel connections tend to support shorter single fibre distances when compared to its counterpart Multi Mode Fibre (MMF) or longwave connections.

SIM

See service information message.

single-mode optical fiber (SM)

Single mode fiber is fiber that is 9 microns in diameter and carries Long Wave length optical signals. The SM fiber casing is yellow in color.

SLDC

See streaming lossless data compression.

SM

See single-mode optical fiber.

Small Computer System Interface (SCSI)

An ANSI-standard electronic interface that allows personal computers to communicate with peripheral hardware, such as disk drives, tape drives, CD-ROM drives, printers, and scanners faster and more flexibly than previous interfaces.

Small Form-factor Pluggable (SFP)

An optical transceiver used to convert signals between optical fiber cables and switches.

SMI-S

See Storage Management Initiative Specification.

SMS

See system management services.

SMSplex

See system-managed storage complex.

SNIA

See Storage Networking Industry Association.

SOM

See System Object Model.

spare

An extra storage component, such as a drive or tape, that is predesignated for use as a replacement for a failed component.

SPCN

See system power control network.

SRAM

See static random access memory.

SRC

See system reference code.

SRN

See service request number.

SSA

See Serial Storage Architecture.

SSID

See subsystem identifier.

SST

See system service tools.

Standard Connector (SC)

The larger of two most popular push-pull type fibre cable connector types.

static random access memory (SRAM)

Random access memory that holds its data in static form (without refreshing), for as long as power is supplied to the circuit.

storage area network (SAN)

A dedicated storage network tailored to a specific environment, combining servers, systems, storage products, networking products, software, and services.

Storage Management Initiative Specification (SMI-S)

A design specification developed by the Storage Networking Industry Association (SNIA) that specifies a secure and reliable interface with which storage management systems (SMSs) can identify, classify, monitor, and control physical and logical resources in a storage area network (SAN). The interface integrates the various devices to be managed in a SAN and the tools used to manage them.

Storage Networking Industry Association (SNIA)

An alliance of computer vendors and universities that focus on developing and promoting industry standards for storage networks.

storage slots

Library slots that hold cartridges.

streaming lossless data compression (SLDC)

A form of lossless compression that compresses the data stream realtime as it is written/sent or decompresses it realtime as it's read/received.

string

The individual combination of a controller drawer and one or more expansion drawers connected to that controller drawer. See also head of string.

subsystem

A secondary or subordinate system, usually capable of operating independently of, or asynchronously with, a controlling system.

subsystem identifier (SSID)

A user-assigned number that identifies a direct access storage device (DASD) subsystem. This number is set by the service representative at the time of installation and is included in the vital product data (VPD).

SUID

See system unique identifier.

support logs

Exportable log bundle for IBM Support diagnostics.

SW

See short wave laser.

symmetric multiprocessing

A system in which all processors are identical, and any processor can execute both user code and kernel code.

Synchronous Data Link Control (SDLC)

A protocol for managing synchronous information transfer over a data link connection.

synchronous dynamic random access memory (SDRAM)

A type of dynamic random access memory (DRAM) with features that make it faster than standard DRAM.

system certificate

The certificate used to secure management communications such as GUI/API and communication between cluster; currently self‑signed only.

system-managed storage complex (SMSplex)

A group of one or more systems that share a common storage management subsystem (SMS) configuration. All systems in an SMSplex share a common set of SMS control data sets: the active control data set (ACDS) and the communications data set (COMMDS).

system management services (SMS)

An interface that provides information about a system or logical partition and that performs tasks such as changing the boot list and setting the network parameters. This interface is used for Linux logical partitions.

System Object Model (SOM)

Object-oriented programming technology for building, packaging, and manipulating binary class libraries.

system power control network (SPCN)

An asynchronous serial communications network. SPCN connects the power system in participating components to the operating system and can report critical changes and power failures in those components to the operating system. SPCN gives the operating system control of electrical power.

system reference code (SRC)

An alphanumeric string of characters (code) that contains information, such as a failing field-replaceable unit, for a service representative, customer engineer, or customer to use for servicing a system.
The characters that identify the name of the unit that detected the condition and the reference code that describes the condition.

system service tools (SST)

The part of the service function used to service the system while the operating system is running.

system unique identifier (SUID)

A 12-character ID that is assigned by the manufacturer.

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tape controller: A logic card located in some tape units that controls input/output tape devices and synchronizes their operation with the operation of the system as a whole.
tasks: Records of user‑initiated actions that can be monitored through to completion.
TB: See terabyte.
TCP/IP: See Transmission Control Protocol/Internet Protocol.
tebibyte (TiB): A base-2 unit of measurement that is equal to 1,099,511,627,776 bytes (2 to the 40th power).
terabyte (TB): For processor storage, real and virtual storage, and channel volume, 2 to the 40th power or 1 099 511 627 776 bytes. For disk storage capacity and communications volume, 1 000 000 000 000 bytes.
terminal type (tty): A generic device driver for a text display. A tty typically performs input and output on a character-by-character basis.
throughput: A measure of the throughput (typically in MBps) from this cluster to another target. Metrics include host reads, host writes, cloud reads, cloud writes, and cluster-to-cluster transfers.
TiB: See tebibyte.
TLS: See Transport Layer Security (TLS).
Transmission Control Protocol/Internet Protocol (TCP/IP): An industry-standard, nonproprietary set of communication protocols that provides reliable end-to-end connections between applications over interconnected networks of different types.
Transport Layer Security (TLS): A security protocol that provides communication privacy. With TLS, client/server applications can communicate in a way that is designed to prevent eavesdropping, tampering, and message forgery.
tty: See terminal type.

U

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UART: See Universal Asynchronous Receiver/Transmitter.
unit reference code (URC): A group of numbers displayed on the console or control panel that identifies failing parts, system or device states, or system or device status conditions.
Universal Asynchronous Receiver/Transmitter (UART): An electronic circuit that transmits and receives data through a serial port.
Universally Unique Identifier (UUID): The 128-bit numeric identifier that is used to ensure that two components do not have the same identifier.
Universal Serial Bus (USB): A serial-interface standard for telephony and multimedia connections to personal computers.
update: Installing a new code level or GUI/API level.
URC: See unit reference code.
used capacity: Amount of a cartridge’s (compressed) capacity allocated for written data.
USB: See Universal Serial Bus.
UTC: See Coordinated Universal Time.
utility program: A computer program in general support of computer processes; for example, a diagnostic program, a trace program, a sort program.
UUID: See Universally Unique Identifier.

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V ac: See volts alternating current.
V dc: See volts direct current.
VDP: See vital product data.
VIO: See virtual input/output.
virtual: Pertaining to not physically existing as such but made by software to appear to do so.
virtual input/output (VIO): A set of storage, server, and network virtualization features that improve performance by binding input/output to a single connection.
virtual partition: A subset of a single server that contains resources (processors, memory, and input/output devices). A logical partition operates as an independent system. If hardware requirements are met, multiple logical partitions can exist within a system.
virtual port: Port exposed by the virtual library for host connections; each virtual port maps to one cluster port.
virtual port mappings: Virtual ports that hosts in a host group can connect through.
virtual service processor (VSP): The firmware that controls the powering on and powering off of a logical partition, including loading the firmware that controls the I/O slots and initializing the memory space of the logical partition.
virtual tape cartridge: Emulated tape cartridge.
virtual tape drive: Emulated tape drive within a virtual library.
virtual terminal: A system object, created and controlled by an application program, that provides a functional representation or simulation of a physical display station.
vital product data (VDP, VPD): Information that uniquely defines system, hardware, software, and microcode elements of a processing system.
vNode: A distributed node in the TS7785 Virtualization Engine that presents the image of virtual drives to the host system.
volts ac: See volts alternating current.
volts alternating current (V ac, volts ac): Unit of potential difference for alternating current.
volts dc: See volts direct current.
volts direct current (V dc, volts dc): Unit of potential difference for direct current.
VPD: See vital product data.
VSP: See virtual service processor.

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WAN: See wide area network.
WBEM: See Web Based Enterprise Management.
Web Based Enterprise Management (WBEM): A set of Distributed Management Task Force (DMTF) standards that defines the protocols used to communicate with a particular Common Information Model (CIM) implementation that uses CIM servers.
wide area network (WAN): A network that provides communication services among devices in a geographic area larger than that served by a local area network (LAN) or a metropolitan area network (MAN). See also local area network.
worldwide ID (WWID): A name identifier that is unique worldwide and that is represented by a 64-bit value that includes the IEEE-assigned organizationally unique identifier (OUI).
worldwide node name (WWNN): A unique 64-bit identifier for a host containing a Fibre Channel port. See also worldwide port name.
worldwide port name (WWPN): World Wide Port Name of a virtual port as seen in the customer SAN.
WOT: See write-ownership takeover.
write-ownership takeover (WOT): A permission that when enabled allows volume ownership to be taken from a failed TS7785 Cluster. Full access is allowed through the remaining available TS7785 Clusters in the grid.
WWID: See worldwide ID.
WWNN: See worldwide node name.
WWPN: See worldwide port name.